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From: Richard Pyle[SMTP:deepreef@bi*.bi*.Ha*.Or*]
Sent: Thursday, September 14, 1995 7:00 PM
To: David Norton (Excell Data)
Cc: 'techdiver@terra.net'
Subject: Re: Tech Training - Restructure/Dismantle
> The deep dives for Deep Air have been conducted at 120-130 ft. and on
air.
> I've been narc'd in the water up here and it would of been real nice to
be
> on 28% mix.
I'm not sure I understand exactly what you mean here, so forgive me if I
missed the point.... but do mean that you think you would experience less
narcosis at 120-130 fsw on nitrox than you would have on air? I know that
all or at least most of the agencies still teach that nitrogen is the only
part of nitrox that causes narcosis, but this concept is quickly being
replaced by a smoewhat more elightened concept (backed up by at least one
study and a hell of a lot of experience from certain individuals) that
the oxygen component of the breathing gas also contributes to narcosis.
The best and easiest rule of thumb is that oxygen contributes to narcosis
about the same amount that nitrogen does. This means all nitrox mixtures
should be thought of as causing the same level of narcosis at a given
depth, regardless of the O2:N2 ratio. Truth is, there is some pretty
convincing anecdotal evidence that, under certain conditions, nitrox
causes MORE severe narcosis than air at a given depth. However, this
seems to be most true when the PO2 exceeds about 1.8 or thereabouts, and
only when the PN2 is pretty high also, so for most nitrox dives, it's
reasonable to consider O2 and N2 equipotent for narcosis.
I personally feel less narc'd at those depths on Nitrox. That's just me.
I belive this has to do more with how much you metabolize oxygen. The
PO2's i carry are generally 1.4 or less. I am in fact VERY conservitive
about that . Because I've metabolized it I've got less inert gas running
around my system. I think Nitrox does me some good.
> One of the recurring themes in the tech community, is self knowledge and
> reliance. Would it not serve people better just to offer a set of skills
> classes and not put standards out there? Just relie on the ability of
> people to judge their own skills and offer training for where they are
at.
> That way the communtiy could adapt best practices as they are found.
A lot of us wish it could be that way; this is the underlying point of my
little banner message I frequently append to the bottom of my messages.
For a few of us, this is reality as well. However, there a couple of
reasons why this ideal does not always work in everyone's reality.
Specifically, standards are important for issues that involve lawyers, and
for people who are in some way responsible for the actions of others (dive
team leaders, institutional diving safety officers, etc).
If you are able to argue a "pure" common law sort of a case to the lawyers,
the thing is you have to be doing everything in your power to make it a
safe dive and standards be damn. If you ignore knowlegde you have that
could make a dive safer, you are negilence. Only perfect knowlegde could
get you through this.
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end
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